C textbox validating event not firing

If I change focus using the tab key, the validating always gets fired.If I give focus to a non-grid control using the mouse, the validation is always getting fired.

Note also that the user can leave a field if it doesn’t have a This entry was posted in controls and tagged C#, C# programming, controls, example, example program, validate field, validate form, Validating event, Windows Forms programming.

I've also simplified it to have only one row/cell.

I've verified the editing control for that column has Causes Validation set to true.

My team members have reviewed, and also can't spot the problem.

Here is a simplified view of my code: Designer Generated Code Edit: Additional Information from Testing There are several dropdownlists in my form.

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